@Override
public int removeAllByProfileHandle(final String profileHandle, final long timeout)
throws IOException, SpaceExceededException {
// first find a list of url hashes that shall be deleted
final long terminate =
timeout == Long.MAX_VALUE
? Long.MAX_VALUE
: (timeout > 0) ? System.currentTimeMillis() + timeout : Long.MAX_VALUE;
int count = 0;
synchronized (this) {
for (Index depthStack : this.depthStacks.values()) {
final HandleSet urlHashes =
new RowHandleSet(Word.commonHashLength, Base64Order.enhancedCoder, 100);
final Iterator<Row.Entry> i = depthStack.rows();
Row.Entry rowEntry;
Request crawlEntry;
while (i.hasNext() && (System.currentTimeMillis() < terminate)) {
rowEntry = i.next();
crawlEntry = new Request(rowEntry);
if (crawlEntry.profileHandle().equals(profileHandle)) {
urlHashes.put(crawlEntry.url().hash());
}
if (System.currentTimeMillis() > terminate) break;
}
for (final byte[] urlhash : urlHashes) {
depthStack.remove(urlhash);
count++;
}
}
}
return count;
}
/**
* count number of references for a given term this method may cause strong IO load if called too
* frequently.
*/
@Override
public int count(final byte[] termHash) {
final Integer cachedCount = this.countCache.get(termHash);
if (cachedCount != null) return cachedCount.intValue();
int countFile = 0;
// read fresh values from file
try {
countFile = this.array.count(termHash);
} catch (final Throwable e) {
ConcurrentLog.logException(e);
}
assert countFile >= 0;
// count from container in ram
final ReferenceContainer<ReferenceType> countRam = this.ram.get(termHash, null);
assert countRam == null || countRam.size() >= 0;
int c = countRam == null ? countFile : countFile + countRam.size();
// exclude entries from delayed remove
synchronized (this.removeDelayedURLs) {
final HandleSet s = this.removeDelayedURLs.get(termHash);
if (s != null) c -= s.size();
if (c < 0) c = 0;
}
// put count result into cache
if (MemoryControl.shortStatus()) this.countCache.clear();
this.countCache.insert(termHash, c);
return c;
}
/**
* special iterator for BufferedObjectIndex: iterates only objects from the buffer. The use case
* for this iterator is given if first elements are iterated and then all iterated elements are
* deleted from the index. To minimize the IO load the buffer is filled from the backend in such a
* way that it creates a minimum of Read/Write-Head operations which is done using the removeOne()
* method. The buffer will be filled with the demanded number of records. The given load value
* does not denote the number of removeOne() operations but the number of records that are missing
* in the buffer to provide the give load number of record entries. The given load number must not
* exceed the maximal number of entries in the buffer. To give room for put()-inserts while the
* iterator is running it is recommended to set the load value at maximum to the maximum number of
* entries in the buffer divided by two.
*
* @param load number of records that shall be in the buffer when returning the buffer iterator
* @return an iterator of the elements in the buffer.
* @throws IOException
*/
public HandleSet keysFromBuffer(final int load) throws IOException {
if (load > this.buffersize) throw new IOException("buffer load size exceeded");
synchronized (this.backend) {
int missing = Math.min(this.backend.size(), load - this.buffer.size());
while (missing-- > 0) {
try {
this.buffer.put(this.backend.removeOne());
} catch (final SpaceExceededException e) {
ConcurrentLog.logException(e);
break;
}
}
final HandleSet handles =
new RowHandleSet(
this.buffer.row().primaryKeyLength,
this.buffer.row().objectOrder,
this.buffer.size());
final Iterator<byte[]> i = this.buffer.keys();
while (i.hasNext()) {
try {
handles.put(i.next());
} catch (final SpaceExceededException e) {
ConcurrentLog.logException(e);
break;
}
}
handles.optimize();
return handles;
}
}
@Override
public void removeDelayed(final byte[] termHash, final byte[] urlHashBytes) {
HandleSet r;
synchronized (this.removeDelayedURLs) {
r = this.removeDelayedURLs.get(termHash);
}
if (r == null) {
r = new RowHandleSet(Word.commonHashLength, Word.commonHashOrder, 0);
}
try {
r.put(urlHashBytes);
} catch (final SpaceExceededException e) {
try {
remove(termHash, urlHashBytes);
} catch (final IOException e1) {
}
return;
}
synchronized (this.removeDelayedURLs) {
this.removeDelayedURLs.put(termHash, r);
}
}
@Override
public void removeDelayed() throws IOException {
final HandleSet words =
new RowHandleSet(
Word.commonHashLength,
Word.commonHashOrder,
0); // a set of url hashes where a worker thread tried to work on, but failed.
synchronized (this.removeDelayedURLs) {
for (final byte[] b : this.removeDelayedURLs.keySet())
try {
words.put(b);
} catch (final SpaceExceededException e) {
}
}
synchronized (this.removeDelayedURLs) {
for (final byte[] b : words) {
final HandleSet urls = this.removeDelayedURLs.remove(b);
if (urls != null) remove(b, urls);
}
}
this.countCache.clear();
}
